Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 22, Pages 3999-4006Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201504201
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Funding
- National Science Foundation [CHE 1412714, DMR 0953112]
- University of Georgia
- Faculty Research Grant (FRG)
- Natural Science Foundation of China (NSFC)
- National Basic Research Program of China (NBRPC) [2012CB922003, 2015CB921201]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1412714] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0953112] Funding Source: National Science Foundation
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Charge transport in amorphous organic semiconductors is governed by carriers hopping between localized states with small spin diffusion length. Furthermore, the interfacial resistance of organic spin valves (OSVs) is poorly controlled resulting in controversial reports of the magnetoresistance (MR) response. Here, surface-initiated Kumada transfer polycondensation is used to covalently graft pi-conjugated poly(3-methylthiophene) brushes from the La0.67Sr0.33MnO3 (LSMO) bottom electrode. The covalent attachment along with the brush morphology allows control over the LSMO/brush interfacial resistance and large spacer mobility. Remarkably, with 15 nm brush spacer layer, an optimum MR effect of 70% at cryogenic temperatures and a MR of 2.7% at 280 K are observed. The temperature dependence of the MR is nearly an order of magnitude weaker than that found in control OSVs made from spin-coated poly(3-hexylthiophene). Using a variety of different brush layer thicknesses, the thickness-dependent MR at 20 K is investigated. A spin diffusion length of 17 nm at -5 mV junction voltage rapidly increased to 48.4 nm at -260 mV.
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